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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
The peak height velocity occurs at a mean of 13.5 years in boys and 11.5 years in girls. The peak height velocity occurs at a mean of 13.5 years in boys and 11.5 years in girls. Pubertal growth accounts for about 20% of final adult height, a total averaging 23-28 cm in females and 26-28 cm in males.